Knob-lock



(No Model.) 2 SheetsSheet .1.

Z/T. FURBISH.

KNOB LOOK.

No. 355,311. Pa/bent'ed Jan. 4, 1887.

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U ITED STATES PATENT Ornrcn.

ZAGHARY T. FURBISH, OF AUGUSTA,-ASSIGNOR 'IO WVILLIAM H. STEVENS,

OF PORTLAND, MAINE.

KNOB-LOCK.

SPECIFICATION forming part of Letters Patent. No. 355,311, dated January 4-, 1887. I Application filed October 20, 1886. Serial No. 210,692. (No model.)

To aZZ whom it may concern.-

Be it known that I, ZAOHARY T. FURBISH, a citizen of the United States, and a resident of Augusta, in the county of Kennebec and State of Maine, have invented anew and useful Knob-Lock, of which the following is a specification, reference being had to the accompanying drawings, in which similar letters represent similar parts throughout the several views.

My invention relates to that class of doorlocks wherein a locking device is employed to prevent the turning of the knob-spindle and theeonsequent movement of the latch, thus dispensing with the separate bolt used in ordi nary locks.

My invention has for its object the construction of a locking device to be operated upon the knobspindle, and which shall be capable of being used as an ordinary night-latchby the use of a button on the inside of the door and a latch-key on the outside, in addition to which it may be used from the outside as an ordinarydoor-lock, and it maybe also set from the inside by a movement of the button in such a manner that it cannot be unlocked from the outside.

My invention consists of a spring-latch having a'vertical bolt on the upper end of which is a tongue made to engage a notch in a circular disk hung on the knob-spindle, and having on its lower end a horizontal offset upon which operates a pin inserted in the face of a small disk or wheel, the latter being actuated or rotated by a button on the inside of the door, the rotation of said button acting to depress the bolt.

It further consists in the combination of thislatching device with a cylindrical lock of peculiar construction, which will hereinafter be more particularly described and claimed.

In the drawings, Figure l is a face view of that part of the lock whichcomes next the door, as seen in looking away from the door. Fig. 2is a section through the door with lock in part section. Fig. 3 is asection through w x of Fig. 4, and shows an enlarged end view of cylindrical lock with key withdrawn. Fig. 4 is a part longitudinal section through the same, also enlarged. Fig. 5 is a central longitudi- FigS': 6, 7,8, I

nal section through the same.

9, and 10 are details of lock and key. Fig. 11 is a portion of same View as'Fig. 1, with parts in adifferent position. Fig. 12 is aview on outside with thumbwheel or button in same position as in Fig. 11. section on line y y of Fig. 1. spective view of bolt.

A is a casing or plate having a recess, A,

Fig. 13 is a horizontal Fig.14 is a perto receive the bolt D. B is the door-knob, 6c

and O is a wheel or disk, through whichpasses the knob-spindle B. Inthe periphery of the wheel 0 is the square notch c, sufficiently'large to receive the tongue d on the upper endof the bolt D. A portion of the bolt D is cut away on one side to make room for the spiral spring E, which rests on the seat e and presses upward the bolt D. On the lower end of the bolt D isa horizontal offset, d, having a width somewhat greater than the thickness of the body of the bolt D. Above the offsetd is the vertical notch d extending some distance up the bolt, and at the side of notch (l is a small downward-opening notch, (1 A vertical portion, (1, of the same thickness as offset (7, extends upward, forming one side of the notch d The button P on the inside of the door is connected with asmall disk or plate, 0, which lies immediately behind the bolt D, and in the face of disk 0, and projecting out over the upper face of offset (1 is the pin 0. (See Fig. 13.)

The button P has next the casing Aa small pointer, p, and just above and in the casing is a mark,p'. (See Fig. 12.) The position of thepointerp and the mark 1) is such that when the bolt D cannot be withdrawn wholly from 0 the notch c, and hence the door cannot be unlocked fromthe outside.

The operation of that portion of my device thus far described is evident. When the button P is turned to the left, Fig. 1, the pin 0' acts asa cam on the offset d and depresses it, thus withdrawing the bolt D from the notch c and unlocking the door. After the button P has turned one-half around, the pin 0 will be directly under the center of disk 0, or on a dead-. 10o

center, and hence will not allow the bolt to rise by the action of the spring E until it is turned tion, The spring V partially encircles 'lution of the pin w depresses the bolt D by the foot n of the tn mblers n and n.

backward. The surface (1*, against which the pin 0 strikes, prevents it from passing beyond the dead-center. Thusin unlatching the door the bolt may be simply withdrawn by turning the button 1? less than one-half, and the knob turned, leaving the bolt to snap back when the door is closed; or by turning the button completely over, as explained, the lock can be disconnected,so that it will not operate at all.

I now proceed to describe the construction and operation of the special locking device by which I actuate the bolt from the outside of the door.

R is the outside cylindrical casing, and S is the inner casing, having at one end two d'ovetail notches, S, and at the other end a series of longitudinal slots, 88, around the periphery of the cylinder. In this-case I show four slots, situated at right angles to each other.

Secured to the casing A are two cleats, a a, one on each side of the recess A, and near its edge, opposite the disk 0. The inner edges of these cleats are recessed or dovetailed in such a manner that the dovetailed notches S in the end of cylinder S slide in between said cleats and thus hold the cylinder and itscontents firmly to the casing A.

Within the cylinder S is the core or central cylinder, VV,having a longitudinal slot or opening, W, which extends from one end nearly to the other, dividing the core into two parts, the two parts being connected by a solid porthe solid portion W, its two ends projecting into the space .W and pressing against the oflsets n of the two tumblers n and it, placed opposite each other. These tumblers are hung by means of pivots in notches w, cut in the edges of the opening W, and they have at one end an offset or foot, n, and at the other end a dog, of. The tumblers n n are slightly narrower than the slots 8 s, so that the end containing the dog will pass freely through said slots. The dogs a are formed to fit into the notches t t of the straight key T, and the inner end of said key is formed to fit the notched or straight faces of the foot-pieces n. The pin 10 is inserted in the end of core W, so that it rests against the top surface of offset (1 of the bolt when said bolt is up. (See Fig. 13.)

The operation of my lock is as follows, 'viz: The key being inserted, its end rests against This forces the dogs a into the notches of the key, allowing the core \V to be turned so that the revobearing on the offset d. During this operation the key is pressed inward, to counteract the pressure of the spring V and to hold the dogs n into the notches of the key. \Vhen the pressure is removed from the key, the springs V press against the feet a of said tumblers and force outward the dogsn", and when the core is turned so that said dogs come opposite the slots 8 sin the cylinder they enter said slots and prevent further rotation of the core, and. at the same time,being forced from the notches "t t of the key, allow the latter to be withdrawn.

The position of the pin w is such that when the key is vertical, as in Fig. 5, the pin is horizontally on a line with the center. Ifthe key is turned a quarter-way around,or ninety degrees to the right, so that the tumblers come opposite the side slots, 8 s, inthe cylinder S, the pin has depressed the bolt and is vertically under the center of the core, or on a dead-center. It also impinges against the surface (1, which prevents it from turning farther in that direction. If the key be now withdrawn, the device is unlocked and cannot be again locked, except by inserting the key and turning it backward. Operated in this man nor, my lock performs the same functions as an ordinary door-lock, as distinguished from a springlocknamely, it does not close with a spring when the key is withdrawn. If it is desired to use it as an ordinary night-latch, the key is pressed in and turned around until the bolt is free. The door is unlatched in the usual way. The key is turned back to a vertical position and withdrawn.

It thus appears that by simply manipulating the button and the key the following operations may be performed, namely: First, the bolt may be simply unlatched by turning the button P to the left; or, second, it can be :thrown out so that it will be entirely disconand unlocked, as in ordinary doors, without making use of the spring.

The pin w of the cylindrical lock,instead of N operating on the surface of the same offset, (1, with the pin 0, may operate on a similar offset placed higher up on bolt D,and independent of pin 0, or it may play in a slot cut in the bolt D, into which it may project.

It is evident that many combinations may be made in my lock by varying the tumblers, the size and shape of the dogs, and the corresponding notches in the key, the end of the key, and the. corresponding portions of the feet of the tumblers.

It is desirable to cut the notches half-way through the key, so that a piece of wire, or othersimilar device may not be inserted to operate the tumblers-and pick the look. When the dogs are made to extend at least half-way across the opening, any such article cannot be used to pick the lock, since the dogs will strike it before being released from the slots 8 8. Two tumblers may be used on each side, in place of one, as here shown, by having a thicker key with notches extending through one-half its thickness.

The cylindrical look here shown may be used on any kind of a door to throw any bolt; and I do not wish to confine its use to spring doorlocks. v

I claim- 1. In a knob-lock, the combination of a bolt having at one end means for'engagingtheknobspindle to prevent it from turning and having an offset, a cam actuated by a button on the inside of the door and operating upon said offset to depress said bolt, a springto press said bolt toward the knob-spindle, and acasing to contain said parts, substantially, as shown.

2. In a knob-lock, the combination of a bolt having at one end means for engaging the knobspindle to prevent it from turning and at the other end an offset, a cam actuated by a button on the inside of the door, said cam operating on said offset to depress said bolt, a downward-opening notch in the bolt to pre'ventthe same from throwing whenthe pin is turned to be vertically under the notch, an indicator to show the position of said pin, a spring to press the bolt against the knob-spindle, and a lock adapted to depress said bolt and operated by a key from the outside of the door, substantially as shown. v

3. In a knob-lock, a bolt having at one end means for engaging the knob-spindle to prevent it fromturning and having an offset upon which operates a cam adapted to depress the bolt, said cam being controlled by a button on the inside of the door, a spring for forcing said an inwardly-projecting dog, a fiat key with lateral notches to receive said dogs, the end of said key conforming to the form of the feet or offsets, a spring to press outward the dog end of said tumblers, a fixed cylindrical case inclosing said core and havinginitsperiphery slits to allow said dogs to pass outward to free 7 themselves from the notches of said key, a pin or projection in said core, and a locking-bolt operated by said pin, substantially as shown.

In testimony whereof I affix my 'siguaturein presence of two witnesses.

ZAGHARY T. FURBISH.

Witnesses:

S. W. BATES, LEwIs SELBING. 

